Enhanced Photocatalytic Activity of MIL-125 by Post-Synthetic Modification with CrIIIand Ag Nanoparticles

2015 ◽  
Vol 21 (31) ◽  
pp. 11072-11081 ◽  
Author(s):  
Reda M. Abdelhameed ◽  
Mário M. Q. Simões ◽  
Artur M. S. Silva ◽  
João Rocha
Keyword(s):  
Photocatalytic Activity ◽  
Ag Nanoparticles

Mesoporous TiO2/SiO2/Ag ternary composite aerogels for high photocatalysis

2019 ◽  
Vol 43 (16) ◽  
pp. 6234-6241 ◽  
Author(s):  
Xinfu Zhao ◽  
Wei Ju ◽  
Jian Zhang ◽  
Benxue Liu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ag Nanoparticles ◽  
High Photocatalytic Activity ◽  
Mesoporous Tio2 ◽  
Ternary Composite ◽  
Composite Aerogels

The TiO2/SiO2/Ag aerogel exhibits high photocatalytic activity due to the presence of Ag nanoparticles, which can decrease the recombination of electrons and holes.

scholarly journals Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Carlos Díaz-Uribe ◽  
Jose Viloria ◽  
Lorraine Cervantes ◽  
William Vallejo ◽  
Karen Navarro ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Ag Nanoparticles ◽  
Nitrate Solution ◽  
Physicochemical Characterization ◽  
Soda Lime Glass ◽  
X Ray

In this work, we synthesized Ag nanoparticles on TiO2 thin films deposited on soda lime glass substrates. Ag nanoparticles were synthesized by photoreduction under UV irradiation silver nitrate solution. X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) measurements were used for physicochemical characterization. The structural study showed that all samples were polycrystalline, main phases were anatase and rutile, and no additional signals were detected after surface modification. Raman spectroscopy suggested that silver aggregates deposited on the TiO2 films could exhibit the surface plasmon resonance (SPR) phenomenon; XPS and SEM analysis confirmed TiO2 film morphological modification after photoreduction process. Photocatalytic degradation of methylene blue (MB) was studied under UV irradiation in aqueous solution, and, besides, pseudo-first-order model was used to obtain kinetic information about photocatalytic degradation. Results indicated that Ag-TiO2 showed an important increase in photocatalytic activity under UV (from 20% to 35%); finally, Ag-TiO2 thin films had kapp value 2.4 × 10−3 ± 0.003 min−1 of 1.8 times greater than the kapp value 1.3 × 10−4 ± 0.0004 min−1 of TiO2 thin films.

scholarly journals Synergistic Effects of Ag Nanoparticles/BiV1-xMoxO4 with Enhanced Photocatalytic Activity

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
Mengting Yu ◽  
Shixiong Zhou ◽  
Qingguo Meng ◽  
Haiqin Lv ◽  
Zhihong Chen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ag Nanoparticles ◽  
Synergistic Effects

Preparation and Photocatalytic Activity of Silver Doped TiO2 Nanotubes

2014 ◽  
Vol 618 ◽  
pp. 14-18
Author(s):  
Ying Cao Xu ◽  
Hong You
Keyword(s):  
Acetic Acid ◽  
Photocatalytic Activity ◽  
Light Intensity ◽  
Anodic Oxidation ◽  
Ag Nanoparticles ◽  
Uv Light ◽  
Effect Factors ◽  
Glycerol Water ◽  
Surface Modified

In this paper, highly ordered TiO2 nanotubes were performed by the method of anodic oxidation, using glycerol / water, NH4F as the electrolyte, and Oxidation voltage to 25v for 1h. TiO2 nanotube surface modified by Ag nanoparticles, by using UV light to restore Ag+ to Ag, the Ag+ from AgNO3 solution sputted out by ultrasonic. Ag-doped TiO2 was used to degrade acetic acid concentrations under UV light. Different Ag/TiO2, HAc concentration, and light intensity were selected as effect factors, TiO2 as contrast test.

scholarly journals Synthesis and Characterization of Electrospun Nanocomposite Nanofibers with Ag Nanoparticles for Photocatalysis Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Srujan Mishra ◽  
S. Phillip Ahrenkiel
Keyword(s):  
Photocatalytic Activity ◽  
Ag Nanoparticles ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Dark Field ◽  
Mixed Phase ◽  
Methyl Red ◽  
Fiber Morphology ◽  
Electrospinning Technique ◽  
Red Dye

Polycrystalline mixed-phase TiO2nanofibers embedded with 2.0% w/v Ag nanoparticles was prepared by the electrospinning technique. Calcination of dry Ag nanoparticles-titanium (IV) isopropoxide/PVP electrospun nanofiber mats in air at for 24 h yielded polycrystalline TiO2/Ag nanofibers. The morphology and distribution of silver nanoparticles were observed by transmission electron microscopy (TEM), scanning TEM (STEM), and high-angle annular dark-field (HAADF) imaging. Mixed-phase anatase and rutile TiO2nanofibers were produced with Ag nanoparticles. High-resolution TEM lattice-fringe measurements showed good agreement with Ag (111), anatase (101), and rutile (110) phases. The photocatalytic activity of TiO2/Ag nanofibers was compared to the photocatalytic activity of pure TiO2nanofibers by studying the photodegradation of methyl red dye under UV light irradiation, in a photoreactor. UV-visible absorbance spectra showed that the rate of decay of the dye in case of photodegradation by TiO2/Ag nanofibers was 10.3 times higher than that by pure TiO2nanofibers. The retaining of the fiber morphology along with the increased surface area due to the addition of Ag nanoparticles can be believed to enhance the photocatalytic oxidation of methyl red dye.

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